Use progress for progress bar & implement register

[snf-image-creator] / image_creator / util.py

diff --git a/image_creator/util.py b/image_creator/util.py
index 63346c8..3cacba0 100644 (file)
--- a/image_creator/util.py
+++ b/image_creator/util.py
@@ -1,6 +1,49 @@
-#!/usr/bin/env python
+# Copyright 2012 GRNET S.A. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or
+# without modification, are permitted provided that the following
+# conditions are met:
+#
+#   1. Redistributions of source code must retain the above
+#      copyright notice, this list of conditions and the following
+#      disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above
+#      copyright notice, this list of conditions and the following
+#      disclaimer in the documentation and/or other materials
+#      provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
+# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+# The views and conclusions contained in the software and
+# documentation are those of the authors and should not be
+# interpreted as representing official policies, either expressed
+# or implied, of GRNET S.A.
 
+import sys
 import pbs
+import hashlib
+from clint.textui import colored
+from progress.bar import Bar
+
+
+class FatalError(Exception):
+    pass
+
+
+silent = False
+
 
 def get_command(command):
     def find_sbin_command(command, exception):
@@ -14,3 +57,68 @@ def get_command(command):
         return pbs.__getattr__(command)
     except pbs.CommadNotFount as e:
         return find_sbin_command(command, e)
+
+
+def error(msg, new_line=True):
+    nl = "\n" if new_line else ''
+    sys.stderr.write(colored.red('Error: %s' % msg) + nl)
+
+
+def warn(msg, new_line=True):
+    if not silent:
+        nl = "\n" if new_line else ''
+        sys.stderr.write(colored.yellow("Warning: %s" % msg) + nl)
+
+
+def success(msg, new_line=True):
+    if not silent:
+        nl = "\n" if new_line else ''
+        sys.stdout.write(colored.green(msg) + nl)
+        if not nl:
+            sys.stdout.flush()
+
+
+def output(msg="", new_line=True):
+    if not silent:
+        nl = "\n" if new_line else ''
+        sys.stdout.write(msg + nl)
+        if not nl:
+            sys.stdout.flush()
+
+
+def progress(message='', bar_type="default"):
+
+    MESSAGE_LENGTH = 30
+    
+    suffix={'default':'%(index)d/%(max)d',
+        'percent':'%(percent)d%%',
+        'b':'%(index)d/%(max)d B',
+        'kb':'%(index)d/%(max)d KB',
+        'mb':'%(index)d/%(max)d MB'}
+
+    return Bar(message=message.ljust(MESSAGE_LENGTH), fill='#', \
+                                                    suffix=suffix[bar_type])
+
+def md5(filename, size):
+
+    BLOCKSIZE = 2 ** 22  # 4MB
+
+    progressbar = progress("Calculating md5sum:", 'mb')
+    progressbar.max = (size // (2 ** 20))
+    md5 = hashlib.md5()
+    with open(filename, "r") as src:
+        left = size
+        while left > 0:
+            length = min(left, BLOCKSIZE)
+            data = src.read(length)
+            md5.update(data)
+            left -= length
+            progressbar.goto((size - left) // (2 ** 20))
+    
+    checksum = md5.hexdigest()
+    output("\rCalculating md5sum...\033[K", False)
+    success(checksum)
+
+    return checksum
+
+# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :